I saw these cookies on We are not Martha  last week. I was intrigued for a few reasons – they are adorable, they are Valentine’s-related, they involve marshmallow fluff, and they feature conversation hearts. I am definitely not a conversation heart fan. I’ve always thought that they are more akin to sugar-flavored chalk than to candy. But to each their own. When I was at Target a few weeks ago I spotted ice cream-flavored conversation hearts (made by Brach’s) — a new spin on a classic! The bag includes strawberry, cherry, orange, vanilla, and chocolate-flavored hearts. I thought these hearts would be perfect for this recipe — and that the flavors would blend well with the marshmallow fluff. Even me, the chalky heart hater, thought these cookies were delicious.
Conversation Heart Marshmallow Cookies
Recipe source: Adapted from We are not Martha 
3/4 cup sugar
1 stick butter, softened
1/2 Tablespoon vanilla extract
1- 2/3 cups all-purpose flour
1/2 teaspoon baking soda
3/4 teaspoon cream of tartar
1/4 teaspoon salt
1-1/4 cups crushed conversation hearts
For the marshmallow filling:
1 7-oz jar marshmallow fluff
1/2 cup shortening
1/3 cup powdered sugar
5. Pour your crushed cookies into the batter and stir to combine.
7. While the cookies are cooling, make the marshmallow filling. Place the marshmallow fluff, shortening, and powdered sugar in the bowl of a stand mixer and mix together until light and fluffy.
8. Place the filling in a pastry bag or ziploc bag (snip a corner off to create a pastry bag). Pipe a blob (very technical term) of marshmallow filling onto the bottom of one cookie and create a sandwich using another.